PORTFS(4) PORTFS(4) NAME portfs, sendfs, youps - we deliver events and messages for Plan B SYNOPSIS portfs [ -abcAD] ] [ -m mnt ] [ -s srv ] [ -n addr ] [ -V vol ] sendfs [ -d ] [ -p portfile ] youps DESCRIPTION The youps program suite (pronounced you-p-s) receives, exam- ines, rewrites, and dispatches plumb(6) messages to ports provided by machines owned by the user. Its behaviour is similar to plumber(4), when used in a centralized setting. Portfs implements a file system that provides message ports. A port can be created by creating a file. Data written to a port is delivered to all processes reading from the port. Data uses to be plumb messages, but it may be any other thing. Once a port has ben read, when all readers of a port close the port, the port is removed. By default, portfs mounts itself at /devs/ports and listens for network clients at tcp!*!11002. Options are similar to those of most file servers, as described in planb(4). Sendfs delivers events to ports. The program services are mounted on the directory /mnt/plumb and consists of two pre-defined files: send. and rules. Programs use write (see read(2)) to deliver messages to the send file, and sendfs decides, looking at its configuration, to which port the message should be sent. The behaviour and configuration is like in plumber(4). Beware that commands used within a plumb rule should supply the -p option to any plumb (1) command issued within the rule. Otherwise, plumb will not be able to deliver the message because there is no send file in the file system as seen by the command (That file is implemented by sendfs only as a front-end for the user). The file rules behaves like in plumber(4) and permits con- figuration of the service. youps is a convenience script that starts the service by running portfs and sendfs after mounting a union of all user ports at /mnt/plumb. PORTFS(4) PORTFS(4) FILES /usr/$user/lib/plumbing default rules file /sys/lib/plumb directory to search for files in include statements. /mnt/plumb mount point for the send file and the union of all ports. The ports of the local machine are mounted above those of others. /devs/ports ports serviced by the local machine. SOURCE /sys/src/cmd/youps SEE ALSO plumber(4), plumb(1), plumb(2), plumb(6) BUGS The delivery of messages across the network is not secured.